The possessive form of the plural noun runners is runners'.
example: The runners' times are logged into the database.
All the runners were ready for the race.
The runners in this race will be relaying the baton rather quickly.
We watched the runners spurt to the finish line
During the marathon, three runners collapsed from exhaustion.
Short legs are a disadvantage for people who compete as runners.
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Many trappers became coureurs de bois or "woods runners" in French.
As the marathon runners entered the homestretch, the crowd cheered them on to the finish line.
220 out of 990 runners are women.
No, the word "runners" is not an adverb.The word "runners" is a noun.
No. Runners is the plural form of runner. A collective noun for runners could be pack -- a pack of runners
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The underlined clause "when the race began" is an adverb clause modifying the adverb "novanent" in the sentence: "The runners increased their speed when the race began."